Thread: (Beginner's calculator) Additional calculation after first result...

Sorry for this crap disguised as a code. Just about finished learning loops...

This is a simple calculator and I have to do one more calculation after the initial calculation (i.e. 120 + 23 = 123, - 33 = 90)

import java.util.Scanner;
 
public class Calc {
 
    public static void main(String[] args) {
 
    Scanner input = new Scanner (System.in);
 
    double first, sec, third, result;
 
    String symbol;   
 
 
    System.out.print("Enter the first value: ");
        first=input.nextDouble();    
    System.out.print("Enter your operator (+,-,*,/): ");
        symbol=input.next();
    System.out.print("Enter the second value: ");
        sec=input.nextDouble();
 
 Scanner input2 = new Scanner(System.in);
 
        switch(symbol){
         case "+":
            result = first + sec;
            System.out.println(result);
 
            String another;
            System.out.print ("Enter another operator (+,-,*,/): ");
                another=input2.next();
            System.out.print(("Enter the third value: "));
                third=input2.nextDouble();
 
            switch(another){
                case"+":
                    System.out.println(result + third);
                    break;
                case"-":
                    System.out.println(result-third);
                    break;
                case "*":
                    System.out.println(result*third);
                    break;
                case "/":
                    System.out.println(result/third);   
                    break;
                default:
                    System.out.println("What the hell?");
                    break;
            }
 
         case "-":
            result = first - sec;
 
            System.out.println(result);
                System.out.print ("Enter another operator (+,-,*,/): ");
            another=input2.next();
            System.out.print(("Enter the third value: "));
                third=input2.nextDouble();
 
            switch(another){
                case"+":
                    System.out.println(result+third);
                    break;
                case"-":
                    System.out.println(result-third);
                    break;
                case "*":
                    System.out.println(result*third);
                    break;
                case "/":
                    System.out.println(result/third);   
                    break;
                default:
                    System.out.println("What the hell?");
                    break;
            }
 
         case "*":
            result = first * sec;
            System.out.println(result);
                System.out.print ("Enter another operator (+,-,*,/): ");
            another=input2.next();
            System.out.print(("Enter the third value: "));
                third=input2.nextDouble();
 
            switch(another){
                case"+":
                    System.out.println(result+third);
                    break;
                case"-":
                    System.out.println(result-third);
                    break;
                case "*":
                    System.out.println(result*third);
                    break;
                case "/":
                    System.out.println(result/third);   
                    break;                
                default:
                    System.out.println("What the hell?");
                    break;
            }
 
         case "/":
            result=first/sec;
            System.out.println(result);
                System.out.print ("Enter another operator (+,-,*,/): ");
            another=input.next();
            System.out.print(("Enter the third value: "));
                third=input.nextDouble();
 
            switch(another){
                case"+":
                    System.out.println(result+third);
                    break;
                case"-":
                    System.out.println(result-third);
                    break;
                case "*":
                    System.out.println(result*third);
                    break;
                case "/":
                    System.out.println(result/third);   
                    break;
                default:
                    System.out.println("What the hell?");
                    break;
            }
         default:
            System.out.println("What the hell?");
            break;     
        }     
    }   
}

I'll never look at a calculator the same way again after this...wow.

I can get the result, but:

(a) displays a weird result after the answer after the correct second calculation (i.e. 12 + 5 = 17.0 - 2, 15.0 7.0 OR 4 / 2 = 2.0 * 8 = 16.0 What the hell?)

(b) it doesn't break like it should after the second calculation. It doesn't end unless "what the hell" comes out.

I'm thinking both are resulting from the same mistake; bracket problem (in switch(another)), but I can't point exactly where and how to fix it...

A few other Q's:

(1) Is there any way to put numeric operations (i.e. +,-) on the same line as my numbers? For example, make 2 + 3 runnable with an intended outcome instead of asking for 2, 3, then +?

(2) How do I make this code better? I know using switch within a switch is 99.99% of the time a big No-No...but I just couldn't find an alternative to get the result at my current level of knowledge (toenail-deep).

It doesn't display any error message...It's a logic error...But I just can't seem to pinpoint where...

--- Update ---

Wow. Wow. I forgot to put breaka at the end of each cases under switch(symbol). Found the problem as I was writing comments from top-down to see what the problem was...

New code:

package calc;
 
import java.util.Scanner;
 
public class Calc {
 
    public static void main(String[] args) {
 
    Scanner input = new Scanner (System.in);
 
    double first, sec, third, result;
 
    String symbol;   
 
 
    System.out.print("Enter the first value: ");
        first=input.nextDouble(); //First value enterable
    System.out.print("Enter your operator (+,-,*,/): ");
        symbol=input.next(); //Operator enterable, will be using switch loop
    System.out.print("Enter the second value: ");
        sec=input.nextDouble(); //Second value enterable
 
    Scanner input2 = new Scanner(System.in); //input for under switch(symbol)
 
        switch(symbol){
         case "+": //when + is entered as an operator
            result = first + sec;
            System.out.println(result);
 
            String another;
            System.out.print ("Enter another operator (+,-,*,/): ");
                another=input2.next(); //2nd set of operator
            System.out.print(("Enter the third value: "));
                third=input2.nextDouble(); //Third value enterable
 
            switch(another){
                case"+":
                    System.out.println(result + third); //Add the third value
                    break; 
                case"-":
                    System.out.println(result-third);
                    break;
                case "*":
                    System.out.println(result*third);
                    break;
                case "/":
                    System.out.println(result/third);   
                    break;
                default:
                    System.out.println("What the hell?");
                    break;
            }
             break; //BREAK THE CASE "+"
 
         case "-":
            result = first - sec;
 
            System.out.println(result);
                System.out.print ("Enter another operator (+,-,*,/): ");
            another=input2.next();
            System.out.print(("Enter the third value: "));
                third=input2.nextDouble();
 
            switch(another){
                case"+":
                    System.out.println(result+third);
                    break;
                case"-":
                    System.out.println(result-third);
                    break;
                case "*":
                    System.out.println(result*third);
                    break;
                case "/":
                    System.out.println(result/third);   
                    break;
                default:
                    System.out.println("What the hell?");
                    break;
            }
             break;
 
         case "*":
            result = first * sec;
            System.out.println(result);
                System.out.print ("Enter another operator (+,-,*,/): ");
            another=input2.next();
            System.out.print(("Enter the third value: "));
                third=input2.nextDouble();
 
            switch(another){
                case"+":
                    System.out.println(result+third);
                    break;
                case"-":
                    System.out.println(result-third);
                    break;
                case "*":
                    System.out.println(result*third);
                    break;
                case "/":
                    System.out.println(result/third);   
                    break;                
                default:
                    System.out.println("What the hell?");
                    break;
            }
             break;
 
         case "/":
            result=first/sec;
            System.out.println(result);
                System.out.print ("Enter another operator (+,-,*,/): ");
            another=input.next();
            System.out.print(("Enter the third value: "));
                third=input.nextDouble();
 
            switch(another){
                case"+":
                    System.out.println(result+third);
                    break;
                case"-":
                    System.out.println(result-third);
                    break;
                case "*":
                    System.out.println(result*third);
                    break;
                case "/":
                    System.out.println(result/third);   
                    break;
                default:
                    System.out.println("What the hell?");
                    break;
            }
             break;
         default:
            System.out.println("What the hell?");
            break;     
        }
 
 
 
    }   
}

I still do want to find out 2 questions: 1. Is there a way to include numeric operator in the same line and still get the result? (ask in one line instead of having to separate values and an operator) 2. Is there a better alternative to my code (other loop, etc)?

1st: Yes and yes. I have a problem enabling Java to recognize certain characters in a string (like capitalizing each word in a string, or math operators in this case). This whole substring (what we learned) thing baffles me...can't grasp the concept

2nd: This is my output:

Enter the first value:
Enter the operator (+,-,*,/):
Enter the second value:
RESULT SHOWN
Enter the operator (+,-,*,/):
Enter the third value:
RESULT SHOWN

I got the result that I wanted...There was no error message. Thank you for so much for helping out, though!

It seems like a lot of code to comlete your task alright. You could try a few else if statments to get the same results.

if (symbol.equals("+")) {
  result = first + second;
} else if (symbol.equals("-")) {
  result = first - second;
} else if   etc ......
System.out.println(result);
 
if(another.equals("+")) {
  total = result + third;
} else if (another.equals("-")) {
   total = result - third;
} else if   etc .......
 
System.out.println(first+" "+symbol+" "+second +" = "+result+" "+another+" "+third+" = "+total);

wrote this on tablet so just showed you the bear bones, hope you can take something from this.
give me shout if you have any questions.